Poly(acrylonitrile)–molybdenum disulfide polymer electrolyte nanocomposite

Abstract

The synthesis, characterization and electrochemistry of a novel nanocomposite based on the co-intercalation of lithium and poly(acrylonitrile) (PAN) in molybdenum disulfide [Li 0.6 MoS 2 (PAN) 1.2 ?0.5H 2 O] is described. The product, obtained chemically by treating LiMoS 2 directly with a colloidal suspension of PAN in benzene, has a lamellar structure with an interlaminar distance of 1.15 nm. Elemental analysis, FT-IR spectra, thermal analysis and 7Li MAS-NMR spectra indicate that the polymer is co-intercalated with lithium in the MoS 2 matrix. Lithium can be de-intercalated and intercalated electrochemically from the nanocomposite in the range x = 0.1-0.8. The structure of the interlamellar phase and the state of lithium in the Li x MoS 2 (PAN) 1.2 intercalates are discussed by comparing the behavior of both the potential and the diffusion coefficient with those of the poly(ethylene oxide) (PEO) and diethylamine (DEA) MoS 2 intercalates. Both, the average quasi-equilibrium Li/Li + potential of PAN nanocomposites (2.85 V) and the lithium diffusion coefficient (4.3 6 10 211 cm 2 s 21 ) at room temperature are encouraging for exploring the use of this nanocomposite as an electrode.

Ni3S2@S-carbon nanotubes synthesized using NiS2 as sulfur source and precursor for high performance sodium-ion half/full cells

“…The NiS 2 absorption peak vanished from the FTIR pattern of Ni 3 S 2 @NSC but the absorption peak of C-S-C appeared at 614 cm −1 [35], indicating the successful sulfur doping after annealing. The presence of C-N peak at 2383 cm −1 indicated the combination of N element with the carbon layer during the hydrothermal process [26,41]. These FTIR results demonstrated the successful doping of sulfur into the carbon skeleton during high-temperature calcination.…”

One‐Pot Synthesis of a Nitrogen‐Doped Carbon Composite by Electrospinning as a Metal‐Free Catalyst for Oxidation of H2S to Sulfur

“…It results in thermal decomposition of PAN and PVP to form the porosity 21. 38 The observed porosity in Figure 2 g and h is attributed to the gasification of PVP, which is acting as a sacrificial template 30. Indeed, PVP has a very low carbon yield and, thus, a large amount of pores were generated during its decomposition within the final material.…”

Electrochemical behavior of lithium intercalated in a molybdenum disulfide-crown ether nanocomposite

“…4) or poly(acrylonitrile) [29], we realize that the latter, due to smaller variation of the potential during the process, are more appropriate as battery electrodes than the former. However, the relatively high lithium diffusion rates together with the notorious potential changes produced in a relatively short lithium concentration range observed for the crown ether derivative might be interesting as material for designing electrochemical switches.…”

“…Van der Waals radii molecular model of the 12-Crown-4 free and intercalated in MoS 2 . Table 1 Comparison of the structural, electrochemical and conductivity properties between molybdenum disulfide nanocomposite with crown ether and poly(ethylene oxide) [29] Compound complexes with more simple ligands like the linear polyethers, we can state that the higher content of lithium indicates a greater excess of negative charge in the MoS 2 sheets.…”